make sure the body bounds are properly updated when manually adding objects

Note : this was working before, this is rather a safety net, if multiple
shapes are added manually :)
[#544] changed to a ellipse shapes as we are dealing with round emoticons ;P
Revert "[#544] changed to a ellipse shapes as we are dealing with round emoticons ;P"

This reverts commit 6b83b551fc00f903c15f210879c794ae2d85cfcd.
[#544] changed to an ellipse collision shape as we are dealing with emoticons